Verification of the Flow Regimes Based on High-fidelity Observations of Bright Meteors

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http://hdl.handle.net/10138/241230

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Moreno-Ibanez , M , Silber , E A , Gritsevich , M & Trigo-Rodriguez , J M 2018 , ' Verification of the Flow Regimes Based on High-fidelity Observations of Bright Meteors ' , Astrophysical Journal , vol. 863 , no. 2 , 174 . https://doi.org/10.3847/1538-4357/aad334

Title: Verification of the Flow Regimes Based on High-fidelity Observations of Bright Meteors
Author: Moreno-Ibanez, Manuel; Silber, Elizabeth A.; Gritsevich, Maria; Trigo-Rodriguez, Josep M.
Contributor: University of Helsinki, Department of Physics
Date: 2018-08-20
Language: eng
Number of pages: 16
Belongs to series: Astrophysical Journal
ISSN: 0004-637X
URI: http://hdl.handle.net/10138/241230
Abstract: Infrasound monitoring has proved to be effective in detection of meteor-generated shock waves. When combined with optical observations of meteors, this technique is also reliable for detecting centimeter-sized meteoroids that usually ablate at high altitudes, thus offering relevant clues that open the exploration of the meteoroid flight regimes. Since a shock wave is formed as a result of a passage of the meteoroid through the atmosphere, the knowledge of the physical parameters of the surrounding gas around the meteoroid surface can be used to determine the meteor flow regime. This study analyzes the flow regimes of a data set of 24 centimeter-sized meteoroids for which well-constrained infrasound and photometric information is available. This is the first time that the flow regimes for meteoroids in this size range are validated from observations. From our approach, the Knudsen and Reynolds numbers are calculated, and two different flow regime evaluation approaches are compared in order to validate the theoretical formulation. The results demonstrate that a combination of fluid dynamic dimensionless parameters is needed to allow a better inclusion of the local physical processes of the phenomena.
Subject: meteorites, meteors, meteoroids
planets and satellites: atmospheres
shock waves
SHOCK-WAVES
ATMOSPHERE
SPECTRA
DENSITY
BODIES
INFRASOUND
ABUNDANCES
POROSITIES
DYNAMICS
ELEMENTS
115 Astronomy, Space science
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